Jackshaft Bearings

[Specky]

Just a bit of an update for Geoffers and his Wiki TBC*

So to cut to the chase.......... "Afirm"

With a 15T press the bearing came out a treat...

As a point of note,

I slightly deformed the bearing by pressing it out by using the inner race. The outer race is hidden by the housing lip, but if you're replacing the bearing chances are it's biffed anyway.

Old bearing:-

O/S Ø 62.03 mm
I/S Ø 29.93 mm
Depth O/S RACE 15.98 mm

New bearing:-

O/S Ø 61.99 mm
I/S Ø 29.92 mm
Depth O/S RACE 15.95 mm

I'll throw it all together when I have a bit of free time... (and a few pics)

BEARING 30 X 62 X 16MM 62062RS

Lotus would charge £383.28 + VAT + labour, or.... £1.49 the LEC way... your call...

I'll have to start trawling the threads for a new project to undertake....





TTFN

[bobbrown]

Is the £1.49 for a cheapo Chinese bearing?
If you are going to all the effort of replacing the bearing would it not be better to use a good quality one?
Do not know how you measured the bearing but they are normally held to close tolerances something in the order of 0 to +15 μm on the od and 0 to -12 μm on the id with the shaft and housing machined to give the nessary fit.

Bob

[Specky]

£1.49 was for the cheap bearing, but like I said, that was only aquired for the dimension check. I will use a better bearing now I have the information. I have a contact in the motor buissnes so the price will be a lot cheaper.

The measurements were taken by vernier, I couldn't seen any real benifit of measuring down to microns.

TTFN

[bobbrown]

Specky,
Did think you had used vernier calipers and most of the digital ones are only accurate to ± 0.02mm, I can get to ± 0.002mm if I use a digital micrometer and that more than accurate enough for what I need.
All the bearings in the same class should have the same dimensional tollerances but I know for a fact the cheapo bearings do not last.

Did you manage to sort out the seals?

Bob

[Specky]

I'm not gonna bother obtaining new seals, they came out a treat and are undamaged.

I used a dedicated puller, but you don't need one.

TTFN

[Specky]

No update as such,

The Jack shaft and bearing carrier are still away at the painters, should be back before christmas.

The surface finish and external corrosion are being removed and then treated to a few layers of oven baked black plastic paint.

I'll update the thread later, when I have the bits back.

TTFN

[Specky]

Bits back...

Black powder coated...

Now waiting for the new bearing (A more expensive/reputable version)

So far in costs:-

Trial bearing... £2
Proper 62062RS SKF BEARING £6
Strip and powder coat £10

So just stage three to go....the rebuild.

[Specky]

New bearing arrived today...

Didn't bother dimension checking it.

Chucked it in the carrier, wizzed in the circlip, banged on the dust seals, threw in the shaft....Bob's your uncle, fannies your aunt...

A piccy or three...

So as they say...Job...Jobbed.









TTFN

[bobbrown]

Bearing dimensions

opps

[Specky]

You cheeky little monkey...

That's not the correct bearing, you're testing all the astute amongst us...

top right of the PDF 6306 2rs1, O/S Ø 72mm....



TTFN

[Specky]

This is the fella I used:-



TTFN

[bobbrown]

clicked on the wrong one!
"you're testing all the astute amongst us..." extra h "amonghst


We all make mistakes said the hedgehog climbing off the lavatory brush.

[Specky]

An "H" ....

Not with you there, it's not like I have an edit button...

TTFN

[petsin]

Just replaced mine after reading this great post.

Managed to do it without using a press. The only slightly tough part was removing the shaft from the bearing, but it eventually gave in with a hub puller, after that I found the outer race had moved tight up against the circlip and had to be lightly tapped back in to remove the circlip. After that the bearing drifted out with minimal fuss, no need for heat.

Replacing I placed the bearing in the freezer and warmed the housing up on to of the radiator and it slid right in. After that putting the shaft in the freezer I drifted the bearing on with a 32mm socket again with minimal fuss.

Totally transformed the car, cutting out the vibration that was plaguing me!

[RayD]

Well done Peter,

Ray

[Tuga2112]

I'm halfway through this process and after reading the thread I got to the point of separating the shaft from the bearing.
But now I'm not sure what is the right approach to remove the dust covers without damaging them.
Can anyone forward some details? I am trying my best to make sure I'm not going to damage anything

[TorqueHorse]

I just did this, let me grab some photos if I have them. In the meantime, here is Simon's advice, which I followed, and all came out ok. viewtopic.php?f=48&t=26163&start=80#p348084

[TorqueHorse]

OK, First to press out the shaft from the bearing, I found some scrap pipe that had just a big enough inner diameter that the brass dust shield (and shaft) could fit inside it, while also bearing on the cast iron bearing hub/knuckle thingie.

(I cut the pipe long enough so that the shaft and brass dust shield had room to fall free inside)

Then you have the bearing hub with the newly exposed rubber seal.


I used a long, dulled screwdriver (in background) to lever out the seal. I think I wedged the screwdriver in there, then turned the whole assembly upside down to whack it on the table, thereby having the handle of the screwdriver hit the table first and the momentum and leverage of the assembly behind it pop out the seal.


After I took out the circlip, I didn't even need to remove the rubber seal from the other side. The bearing had plenty of meat showing to be pressed out ok.


hope that helps

[Tuga2112]

Thanks for the info.
I've now replaced the bearing. No problems at all with pulling out and putting the new one.

Next question is, what type of grease is meant to go there now?
I have lithium and moly grease already in the garage as well as packets of "CV joint" grease that came with boots.
The bearing seems to have a rubber shield, I've used lithium in CV boots before but that doesn't mean it's the right thing to do

[TorqueHorse]

I've now replaced the bearing. No problems at all with pulling out and putting the new one...Next question is, what type of grease is meant to go there now?

Nice, glad to hear that! I just used a "Red" hi-temp/hi-pressure bearing grease, since it seemed like that was the type of application.